Services instead of Products

Services instead of Products

Our company doesn't sell products. We sell services. We sell advertising in some of our publications. Therefore, I need to be able to create unlimited quantity services that have start and expiration dates.

I know I could edit the products tab, but it is still based on Quantity, instead of time. I dont want to have to create our services for every month and include them in the products tab. That will become way too large. I want to create the advertisement service one time and then just be able to add as many to the client as I want, but have them based on dates, instead of quantity.

Is this possible?